Oncogenes are Mutant Forms of Proto-Oncogenes

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Oncogenes arise from the mutation of proto-oncogenes. Since they are mutant forms of proto-oncogenes, oncogenes resemble proto-oncogenes in that they code for the production of proteins involved in growth control. However, oncogenes code for an altered version (or excessive quantities) of these growth-control proteins, thereby disrupting a cell's growth-signaling pathway.

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